Abstract
A group contribution procedure, on the basis of SAFT-γ equation, is extended to cover new families of imidazolium-based ionic liquids (ILs), with either the [MeSO3], [MeSO4], [EtSO4] or [CF3SO3] anions. The IL groups of the SAFT-γ equation were fit to IL density data at temperatures from 293.15 to 393.15 K. Pressures varied up to 60 MPa. The groups corresponding to the CO2+IL systems were optimized by the solubility data of CO2 in the ILs. The binary system data covered temperatures from 273.15 to 413.15 K, with pressures going up 27 MPa. In addition to the accuracy of estimations, the strength of SAFT-γ in predictions was investigated by estimating both the density of ILs, and the bubble-point pressures for some mixtures of CO2+ILs which were not considered in the fitting process. The average absolute relative deviations in density and bubble pressure predictions did not exceed 2.78% and 4.97%, respectively.
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